non permanent joints
TRANSCRIPT
![Page 1: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/1.jpg)
NON PERMANENT JOINTS
Héctor Alejandro Ramírez VillalpandoElvira Graciela Córdova Núñez
![Page 2: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/2.jpg)
Nonpermanent Joints
The most common method of mechanical fastening is by using bolts, nuts, screws, rivets, pins, and a wide variety of other fasteners, these techniques are also known as mechanical assembly.
![Page 3: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/3.jpg)
These assemblies may be structural (load-bearing) components and thus may be subjected to both shear and tensile stresses.
![Page 4: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/4.jpg)
Nonpermanent
Screw
Snap
Shrink
![Page 5: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/5.jpg)
Hole Preparation A hole in a solid body can be
produced by punching, drilling, chemical and electrical means, and high-energy beams, depending on the type of material, its properties, and its thickness.
Can be produced also during casting, forging, extrusion and powder metallurgy.
Hole has a tendency to reduce the component’s fatigue life.
![Page 6: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/6.jpg)
Threaded Fasteners
Bolts
Screws
Nuts
![Page 7: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/7.jpg)
Threaded Fasteners
If the joint is to be subjected to vibration, such as in aircraft and various types of engines and high-speed machinery, several specially designed nuts and lock washers are available. They increase the frictional resistance in the torsional direction, thus preventing vibrational loosening of the fasteners.
![Page 8: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/8.jpg)
Types of Screws
![Page 9: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/9.jpg)
Construction
![Page 10: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/10.jpg)
Nuts
![Page 11: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/11.jpg)
Washers
![Page 12: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/12.jpg)
Rivets Most common
method: Riveting Used in the
construction and assembly of large commercials aircraft.
There are several types of rivets, and some may be solid or hollow.
![Page 13: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/13.jpg)
Other Methods Of FasteningMetal Stitching or stapling
Is much like that of ordinary stapling of papers.
This operation is fast and particularly suitable for joining thin metallic and nonmetallic materials, and it does not require holes to be made in the components.
![Page 14: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/14.jpg)
Seaming Seaming is based
on the simple principle of folding two thin pieces of material together.
For example: The lids of
beverage cans Containers for
food Household
products
![Page 15: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/15.jpg)
Crimping Is a method of
joining without using fasteners.
Can be used on both tubular and flat parts.
Caps on glass bottles are attached by crimping.
![Page 16: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/16.jpg)
Snap-In Fasteners Widely used in automotive bodies
and household appliances. They are economical and permit
easy and rapid component assembly. Particularly for plastic products.
![Page 17: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/17.jpg)
Shrink and press fit Is based on the principle
of the differential thermal expansion and contraction of two components.
Typical applications include the assembly of die components and mounting gears and cam on shafts.
In press fitting, one component is forced over another, resulting in high joint strength.
![Page 18: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/18.jpg)
Advantages
Ease of manufacturing Ease of assembly and transportation Ease of parts replacement, maintenance,
and repair Ease in creating designs that require
movable joints, such as hinges, sliding mechanisms for drawers and doors, and adjustable components and fixtures.
Lower overall cost of manufacturing the product.
![Page 19: Non Permanent Joints](https://reader035.vdocument.in/reader035/viewer/2022081422/5524c5c94a7959d4488b492d/html5/thumbnails/19.jpg)
Overview
Non-permanent joints: fasteners, screws, nuts Practical, quick, lots of options Disassemble-ability is important for
prototyping and learningPermanent joints: welding, rivets Hard to teach welding w/o equipment You can’t really take apart these
things without a lot of effort